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/*-------------------------------------------------------------------------
*
* win32fseek.c
* Replacements for fseeko() and ftello().
*
* Portions Copyright (c) 1996-2023, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/port/win32fseek.c
*
*-------------------------------------------------------------------------
*/
#ifdef FRONTEND
#include "postgres_fe.h"
#else
#include "postgres.h"
#endif
#if defined(WIN32) && defined(_MSC_VER)
/*
* _pgfseeko64
*
* Calling fseek() on a handle to a non-seeking device such as a pipe or
* a communications device is not supported, and fseek() may not return
* an error. This wrapper relies on the file type to check which cases
* are supported.
*/
int
_pgfseeko64(FILE *stream, pgoff_t offset, int origin)
{
DWORD fileType;
HANDLE hFile = (HANDLE) _get_osfhandle(_fileno(stream));
fileType = pgwin32_get_file_type(hFile);
if (errno != 0)
return -1;
if (fileType == FILE_TYPE_DISK)
return _fseeki64(stream, offset, origin);
else if (fileType == FILE_TYPE_CHAR || fileType == FILE_TYPE_PIPE)
errno = ESPIPE;
else
errno = EINVAL;
return -1;
}
/*
* _pgftello64
*
* Same as _pgfseeko64().
*/
pgoff_t
_pgftello64(FILE *stream)
{
DWORD fileType;
HANDLE hFile = (HANDLE) _get_osfhandle(_fileno(stream));
fileType = pgwin32_get_file_type(hFile);
if (errno != 0)
return -1;
if (fileType == FILE_TYPE_DISK)
return _ftelli64(stream);
else if (fileType == FILE_TYPE_CHAR || fileType == FILE_TYPE_PIPE)
errno = ESPIPE;
else
errno = EINVAL;
return -1;
}
#endif /* defined(WIN32) && defined(_MSC_VER) */
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